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/* $OpenBSD: bioskbd.S,v 1.7 1997/05/31 15:38:45 mickey Exp $ */
/*
* Copyright (c) 1997 Michael Shalayeff
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Michael Shalayeff.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <machine/asm.h>
#define _LOCORE
#include <dev/isa/isareg.h>
#include <dev/ic/mc146818reg.h>
#include <i386/isa/nvram.h>
#include "biosdev.h"
#undef _LOCORE
/*
* int kbd_probe();
* probe if keyboard present
*
*/
ENTRY(kbd_probe)
movb $NVRAM_EQUIPMENT, %al
outb %al, $IO_RTC
inb $(IO_RTC+1), %al
xorl %edx, %edx
andb $(NVRAM_EQUIPMENT_KBD|NVRAM_EQUIPMENT_DISPLAY), %al
cmpb $(NVRAM_EQUIPMENT_KBD|NVRAM_EQUIPMENT_DISPLAY), %al
je 1f
incl %edx
1: movl %edx, %eax
ret
/*
* void kbd_putc(int c)
* output byte to console
*/
ENTRY(kbd_putc)
pushl %ebx
xorl %eax, %eax
movb 8(%esp), %al
movb $0x0e, %ah
xorl %ebx, %ebx
incl %ebx
BIOSINT(0x10) # display a byte
popl %ebx
ret
/*
* int kbd_getc(void)
* read character from keyboard
*/
ENTRY(kbd_getc)
pushl %ebx
pushl %ecx
xorl %eax, %eax
BIOSINT(0x16)
movzbl %al, %eax
popl %ecx
popl %ebx
ret
/*
* int kbd_ischar(void)
* check if there is character available from keyboard
*/
ENTRY(kbd_ischar)
pushl %ebx
pushl %ecx
xorl %eax, %eax
incb %ah
BIOSINT(0x16)
setnz %al
movzbl %al, %eax
popl %ecx
popl %ebx
ret
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